Minecraft 1.16.1
Fabric 0.8.8+build.202
LWJGL 3.2.2
Fabric API 0.14.0+build.371-1.16
Identity 1.0.3-beta-1.16
When disguised as a Ghast and holding some Fire Charges, using one causes a cooldown animation that looks like this:
For other player item usage, it looks like this: